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You need something like the Blackmagic Multiview: https://www.blackmagicdesign.com/products/multiview or Matrox Quad-Split http://www.matrox.com/video/en/products/microquad/ or Decimator MD-QUAD http://decimator.com/Products/MultiViewers/MD-QUAD%20Quad-Split%20MultiViewer/MD_Quad.html
These units take HD-SDI input and can then display it on a HDMI (or SDI) ...